Question

Three years has passed _________ they came to this school.

A．since

B．for

C．when

D．before

Answer 1

A

解析試題分析：句意：自從他們來到這所學校，時間已過去三年了。A. since自……以來；B. for 因為；C. when當......的時候 ；D. before在……以前。根據句意，故選A。
考點：考查連詞的用法。